68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
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/* gsl_inline.h
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*
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* Copyright (C) 2008, 2009 Brian Gough
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __GSL_INLINE_H__
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#define __GSL_INLINE_H__
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/* In recent versiions of GCC, the inline keyword has two different
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forms: GNU and C99.
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In GNU mode we can use 'extern inline' to make inline functions
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work like macros. The function is only inlined--it is never output
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as a definition in an object file.
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In the new C99 mode 'extern inline' has a different meaning--it
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causes the definition of the function to be output in each object
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file where it is used. This will result in multiple-definition
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errors on linking. The 'inline' keyword on its own (without
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extern) has the same behavior as the original GNU 'extern inline'.
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The C99 style is the default with -std=c99 in GCC 4.3.
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This header file allows either form of inline to be used by
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redefining the macros INLINE_DECL and INLINE_FUN. These are used
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in the public header files as
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INLINE_DECL double gsl_foo (double x);
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#ifdef HAVE_INLINE
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INLINE_FUN double gsl_foo (double x) { return x+1.0; } ;
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#endif
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*/
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#ifdef HAVE_INLINE
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# if defined(__GNUC_STDC_INLINE__) || defined(GSL_C99_INLINE) || defined(HAVE_C99_INLINE)
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# define INLINE_DECL inline /* use C99 inline */
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# define INLINE_FUN inline
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# else
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# define INLINE_DECL /* use GNU extern inline */
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# define INLINE_FUN extern inline
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# endif
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#else
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# define INLINE_DECL /* */
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#endif
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/* Range checking conditions in headers do not require any run-time
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tests of the global variable gsl_check_range. They are enabled or
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disabled in user code at compile time with GSL_RANGE_CHECK macro.
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See also build.h. */
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#define GSL_RANGE_COND(x) (x)
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#endif /* __GSL_INLINE_H__ */
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